使用Camera2+ opengl动态修改图像饱和度
2018-10-09 本文已影响124人
vb12
示例效果:
参考如下示例完成:
https://github.com/aleksas/androidGlesCamera2
片元着色器:
#extension GL_OES_EGL_image_external : require
precision mediump float;
varying vec2 aCoordinate;
uniform samplerExternalOES vTexture;
uniform lowp float saturation;
// Values from "Graphics Shaders: Theory and Practice" by Bailey and Cunningham
const mediump vec3 luminanceWeighting = vec3(0.2125, 0.7154, 0.0721);
void main(){
lowp vec4 textureColor = texture2D(vTexture, aCoordinate);
lowp float luminance = dot(textureColor.rgb, luminanceWeighting);
lowp vec3 greyScaleColor = vec3(luminance);
gl_FragColor = vec4(mix(greyScaleColor, textureColor.rgb, saturation), textureColor.w);
}
使用GLSurfaceView显示, 所有对egl环境就不需要自己初始化了, 只需要关注生成一个纹理Texture:
GLES20.glGenTextures(1, hTex, 0)
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, hTex[0])
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE)
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE)
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST)
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST)
....
mSurfaceTexture = SurfaceTexture(hTex[0])
mSurfaceTexture.setDefaultBufferSize(mSurfaceView.width, mSurfaceView.height)
mSurfaceTexture.setOnFrameAvailableListener(this)
然后把这个创建的mSurfaceTexture 对象传给Camera:
val surface = Surface(surfaceTexture)
// We set up a CaptureRequest.Builder with the output Surface.
mPreviewRequestBuilder = mCameraDevice!!.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
mPreviewRequestBuilder!!.addTarget(surface)
因为使用了Camera2, 所以摄像头操作操作方式有变化, 还需要适应.
